There is a Jagenberg AG which is still in business today. They make big machines for paper converting, etc. Their website is http://www.jagenberg.com/ The website is in German but Google translated it.

However, I don’t think this is the same company. There is a history tab (history is geschichte in German) on their website, and the initials of the early principals of that company don’t correspond with the “H. R.” Jagenberg on the press plate. Also, the press plate says Coln (Cologne), and the company on the net was in Dusseldorf in its early days.